Many people with sexually transmitted infections (STIs) do not get symptoms, so it's worth getting tested even if you feel fine. If you think you have an STI, the earlier you're tested, the sooner treatment can be given if it's needed.

An STI can be passed from one person to another through sexual contact, including vaginal, anal and oral sex.

STIs can pass between men and women, and from women to women and men to men.